Feed mechanism for machine tool units



Feb. 4, 1936. E. J. KINGSBURY FEED MECHANISM FOR MACHINE TOOL UNITS Filed Aug. 2', 1932 8 Sheets-Sheet l huh Fgb. 4, 1936. E. J. KINGSBU RY FEED MECHANISM FOR MACHINE TOOL: UNITS Filed Aug. 2, 1.952 8 Sheets-Sheet 2 Feb. 4, 1936. E. J. KINGSBURY FEED MECHANISM FOR MACHINE TOOL UNITS Filed Aug. 2, 1952 8 Sheets-Sheet 3 IEF-E Feb. 4, 1936. E. J. KINGSBURY 2,030,007

FEED MECHANISM FOR MACHINE TOOL UNITS I Filed Aug. 2, 1932 8 Sheets$heet 4 Feb. 4, 1936. E. J. KINGSBURY FEED MECHANISM FOR MACHINE TOOL UNITS Filed Aug. 2, 1932 8 Sheets-Sheet 5 Feb. 4, 1936. E. J. KINGSBURY 2,030,007

FEED MECHANISM FOR MACHINE TOOL UNITS 8 Sheets-Sheet 6 Feb. 4, 1936. E. J. KINGSBURY FEED MECHANISM FOR MACHINE TOOL UNITS Filed Aug. 2, 1932 8 Sheets-Sheet 7 Feb. 4, 1936. E. J. KINGSBURY 2,030,007

FEED MECHANISM FOR MACHINE TOOL UNITS Filed Aug. 2, 1952 8 Sheets-Sheet 8 Patented Feb. 4, 1936 PATENT OFFICE FEED MECHANISM FOR MACHINE TOOL UNITS Edward Joslin Kingsbury, Keene, N. H.

' Application August 2, 1932, Serial No. 627,284

24 Claims.

The present invention relates to improvements in feed mechanism for machine tool units of the type employing a tool which operates by reciproeating action with respect to a fixed frame memher.

One of the features of the present invention is the provision of means for afiording a flexible feed which is simple and easily adjusted to various conditions of initial and working feeds.

Another feature of the present invention is the provision of an overload release for such a feed mechanism, which may easily be adjusted as to the point of slippage under overload.

A further feature of the present invention is the provision of an overload release for a feed mechanism, including means for accomplishing a withdrawal of the tool upon overload release.

Still another feature of the present invention is the provision of a planetary intermesh system with looking elements for accomplishing a rapid initial and slow working feed.

Still another feature of the present invention is the provision of means for controlling the initial and working feeds by a device which is operated in unison with the tool movement.

with these and other objects in view as will appear in the course of the following specification and claims an illustrative form of construction of device in accordance with the present invention is set forth in the accompanying drawings, in which:

Fig. 1 is a side elevation of the tool unit with side plate removed;

Fig. 2 is a vertical longitudinal section of the same substantially on line 2-2 of Fig. 3;

Fig. 3 is a transverse vertical sectional view substantially on line3-3 of Fig. 2;

Fig. 4 is a. horizontal sectional view substantially on line 4-4 of Fig. 3;

Fig. 5 is a transverse vertical sectional view substantially on line 5--5 of Fig. 2;

Fig. 6 is a fragmentary longitudinal vertical sectional view substantially on line 66 of Fig. 3;

Fig. '7 is a transverse vertical sectional view substantially on line 1-1 of Fig. 1;

Fig. 8 is a longitudinal vertical fragmentary sectional view substantially on line 8--8 of Fig. 7;

Fig. 9 is a circuit diagram of the electrical connections arranged in one manner;

Fig. 9a is a similar diagram, with the connections arranged in another manner.

In these drawings, the machine tool is illustrated as a drilling unit having a quill which is fed forward for a rapid initial and a. slow working feed, and returned to withdrawn position.

The spindle for the drill is rotated from one driving system. A second driving system is connected for effecting the feeding movement. Limit devices are provided and in addition thereto a control system is employed and connected I for movement in unison with the tool so that it operates to determine the rapid initial feeding, the slow working feeding and a rapid withdrawal from fed position. An overload release is provided whereby the unit is relieved of feed 10 upon an overload, and a connection between this release and the second driving system permits a withdrawal of the tool upon overloading.

In the drawings, the first driving system is illustratively represented as including a pulley Ill, 16 which may be driven from any desirable external source of ower such as an electric motor (not shown). his pulley l0 (Fig. 2) is connected to a vertical shaft ll, supported by bearings in an end housing I2 of the unit frame. The shaft ll 20 is provided with a bevel gear l3 at its lower and inner end, which is engaged with a bevel gear l4 fixed to a hollow shaft 15 journaled within the main body B of the unit frame. The hollow shaft l5 has internal teeth iia which mesh in grooves .25 of an axially ribbed spindle It, so that the hollow shaft and spindle turn together at all times and a permissive relativeaxial movement of the tool may be accomplished. The spindle I6 terminotes in a head lSa external to the unit frame for connection to a drill. The spindle I6 is journaled adjacent its head I611 in bearings carried by the quill l1, so that the spindle may rotate inside the quill, but is supported against relative axial movement with respect thereto. The quill is provided with rack teeth ila for engagement by the feeding gear teeth 36 on a hollow shaft 58 mounted around a transverse spindle l9.

Mounted in a cavity of the frame body B is a feed motor 20, constituting in the illustrated as- 40 sembly the second driving system and o rating to efiect the feeding and withdrawal of the tool. The shaft 2! of the armature 20 of an auxiliary motor extends parallel to the spindle l6 and is suitably journaled in the body B, and carries fixed thereto a gear 22 (Figs. 2 and 3) which is in mesh with a gear 23'on a longitudinal shaft 24, likewise journaled in the frame body B. A worm 25 is keyed to shaft 21 so that it turns in rotation therewith but has a relative permissive axial 0 movement with respect thereto. This worm 25 (Fig. 4) is normally forced toward the left by a pressure member 26 rotatably mounted in a plunger 21 which is pressed by a spring 28 for forcing the worm 25 toward the left. The pressure of spring 28 may be regulated by an external-. ly accessible screw threaded member 29. The plunger 21 is provided with an externally proiecting push rod 30 for operating an overload switch, as will be described in detail hereinafter.

In Fig. 3 it will be noted that the worm 25 is in mesh with worm gear teeth 8| on a hollow planetary body member 32, which" has an end closing plate 22 fixedly connected therewith. The body member 32 and the closing plate 30 are provided with a fixed shaft 34, upon which is mounted a planet pinion 35. Extending within the cavity of the planetary body member 02, is the hollow shaft I8 having for example, twentyeight gear teeth 31 thereon in mesh with the planet pinion 35. Within the hollow shaft I is the spindle I8 having, for example, twentyseven gear teeth 39 thereon, which likewise are in mesh with the planet pinion 25. The whole assembly is supported by suitable bearings in the frame body B. The hollow shaft I0 is provided with gear teeth 85 in mesh with the rack teeth IIa of the quill. This hollow shaft I8 is keyed at its end to a gear 40 which meshes (Figs. 1 and 8) with a gear 4I, loosely rotatable about a pin 42 (Fig. 7). The gear H is preferably of insulating material, as will be described hereinafter.

The spindle I9 is keyed at its end to a gear 42, serving as a stop ratchet when engaged by a pawl 44 (Fig. 1) which normally is held out of engagement by a spring 45, but may be pulled into engagement by the plunger 40 of a solenoid I35 in a housing 41. The end plate 22 of the planetary body is illustrated as provided with a friction shoe 48 for axial engagement with the spindle I9. A spring forces the spindle I0 into frictional engagement with the shoe 40, and the action of this spring 40 ,may be regulated by an externally accessible threaded member 50 (Fig. 3). I

The outer end of the quill I1 is provided with a crosshead (Figs. 1 and 2) which has clamped thereto the end of a control rod 52, which is guided in brackets 53 of the frame body B and is provided along its length with a collar 54 which normally is forced toward the right (Figs. 1 and 2) by a spring 55 surrounding the control rod 52 and thus tending always to feed the spline and drill toward the work. The left hand end (Figs. 1 and 2) of the control rod 52 engages in the withdrawn position of the drill with a roller 50 carried by the arm 51 of a switch bridge 50 located within a housing 50. The switch is normally held closed by a spring 50 but is opened by the engagement of the control rod 52 with the roller 56.

The push rod 30 (Fig. 4) on plunger 21 proiects externally to the body B and may engage a with a roller 6| on an arm 82 pivotally mounted within a switch housing 53 so that the switch bridge 64 is closed upon a predetermined movement of the plunger 21 toward the right (Fig. 4) these contacts being opened again upon leftward movement of the plunger 21 by the return spring As shown in Figs. 3 and 6, the pivot 24 for planet pinion 35 is reduced in diameter at its ends for engage ent in the planetary body 32 and in end plate 33 and is provided with bearing sleeves 86 within the planet pinion 05. The central larger portion of the pivot pin 34 is cut away to provide flat chordal surfaces (Fig. 6) each terminating adjacent one end in a substantially radial surface, whereby notches are provided for the reception of the rollers 0'! which cooperate with the flat chordal surfaces of pin 34 and with the internal surface of planet pinion 35 to provide an overrunning clutch.

The gear 4|, which preferably is of insulating material, carries thereon a contact member insulated from the machine frame, which is annular in shape and provided with a radial extension II (Figs. 1 and 8). Four brushes 12, 13, I4 and I5 cooperate with this contact member I0. One of these brushes (13) is illustrated in Fig. '7 and is shownto comprise a body 80 supported in an insulated plate BI and provided internally with a passage in which is located a compression spring 82 and a brush 03 with engagement with the extension II of the contact member 10 at predetermined times. The plate 8I (Fig. 1) is securely bolted to the frame body E.

In the circuit diagram of Figure 9, the electrical parts of the mechanism are shown as connected to a source of supply comprising the threephase network having conductors I00. A main switch IOI controls the supply of current by phase conductors I02a, I021), I020 to the main driving motor M which is belt connected to the pulley I0. One phase conductor I02a is directly connected by a branch conductor I03 to the auxiliary motor A having the armature 20 (Fig. 2). Another phase conductor I02b is connected by a conductor I04 to a contact which may be closed by a normally open bridge I05 of a reversing relay which may be closed by the energlzation of a solenoid I05. The conductor I04 is likewise connected to a contact which may be closed by a normally open bridge I01 of a forward relay, which may be closed by energization of a solenoid I08. The third phase conductor I02c is connected by a conductor I09 to a normally open contact which may be closed by a. bridge H0 in the reversing relay, and also to a normally open contact which may be closed by a bridge III in the forward relay. The other contact of bridge III, and the other contact of bridge I05 are connected by a conductor II2 to the auxiliary motor A. The other contact of bridge I01 and the other contact of bridge IIO are connected by conductor II3 to the auxiliary motor A. It will be noted that the inverse connections of the "reversing and forward relays will accomplish the operation of the auxiliary motor A in opposite directions accordingly as the solenoid I05 or I08 is selectively operated.

The phase conductor I02a and conductor I03 are likewise joined by a conductor II4 to a normally open contact controlled by a bridge II5 which may be closed by energization of the solenoid IIG of a stopping relay; this conductor I I4 is likewise joined to a normally closed contact controlled by a bridge II'I likewise sub ject to the operation of the solenoidIIB. The phase conductor I02c is connected by a conductor II8 to one terminal of the solenoid II 6. This stopping relay also has a bridge I I9 which j,. normally closes a pair of contacts, of which one is joined by a conductor I20 to the second contact of the normally open bridge H5; while the other contact of bridge II 9 is joined by conductor I2I to a contact of, the normally open but manually operable trip" switch I22 which is joined at its other contact by a conductor I 23' bridge I25 is joined by conductor I28 to a northe operation of solenoid I08 of the forward" relay. The second contact of bridge'I21 is connected to the conductor I 20, and thus to one terminal of the solenoid I08. The other terminal of the solenoid I08 is joined by a conductor I28 to the conductor I020. The solenoid I08 is likewise connected to the conductor I020, and at its other terminal by a conductor I29 with one contact of a normally open but manually closable reversing switch I80 which is connected by its other contact and a conductor I 3| with a contact of a normally closed bridge I32 in the forward relay actuated by solenoid I08 The second contact of bridge I32 is Joined by conductor I33 with a normally open contact of a bridge I34 actuated by solenoid I08. The second contact of bridge I34 is joined by the conductor I29. The solenoid I35 of the latching device 44 has one terminal connected by conductor I36 to the phase conductor I 020; the other terminal of solenoid I35 is joined by a conductor I36a to a normally open contact controlled by a bridge 31 of a latch relay which bridge has a second contact joined to a bus conductor I38 which is connected to the conductor II3 of auxiliary motor A and to one terminal of the control solenoid I39 of the latch relay. A second bridge I40 controlled by solenoid I39 normally holds contacts open, of which one is joined by conductor I M with the other terminal of the solenoid I39 and also with the brush 15 which operates in conjunction with theextension ll of rotatable'contact piece 10. The second contact of bridge I40 is joined by a bus conductor I45 with the inner brush 12 engaging the rotatable contact piece 10. A normally open contact of the bridge 58 of one limit switch, a normally closed contact of the bridge 64 of the other limit switch and a normally open contact of the manually closable bridge I49 of the forward switch are all likewise connected to the bus conductors 45, which itself is connected to the conductor I03 and then to the phase conductor I 0211. The other contact of the bridge 64 is joined to conductor I29. The other contact of bridge 58 is joined to conductor I3I. The other contact of forward switch bridge I49 is joined by a conductor I50 with a second brush 13 cooperating with the extension II: the conductor I50 also is connected to the other terminal of the solenoid lit. The third brush 14 cooperative with the contact extension H is joined to conductor 129.

In operation, when the parts are at a standstill, the motors are (lo-energized, all relays are open, the latch controlled by a solenoid I35 is disengaged, limit switch 58 is closed and limit switch 84 is open, and the contact extension TI is resting just to the right or clockwise (Fig. 9) of the brush 13.

When main switch SM is closed, current flows from the network conductors I through the phase conductors i02a, I02b, i020 to the main motor M, and this motor begins to drive the spindle.

The trip switch I22 is now depressed to start the cycle. Current now flows from upper conductor I 00 (connected to conductor I02a), by conductor I23 to trip switch I22 and back by conductor I2I to the normally closed bridge H9 and thence by conductor I20 to solenoid I08 and back by conductor I 28 to phase conductor I02c and thus to the line. Solenoid I08 is energized and moves its bridges I01, III, I21 and I32. A

holding circuit is then established from the upper mally open contact controlled by bridge I21 under 'main conductor I00 and phase conductor I02a by conductor I I4, normally closed bridge I I1, conductor I24, normally closed bridge I25, conductor I 28, bridge I21 (now closed), conductor I20, solenoid I08, conductor I 28, and back to phase conductor I020. The opening of trip switch therefore does not de-energize the solenoid The closure 01 bridges I01, III, upon the energization of solenoid I08, connects the phase conductors I02b and N20 to the auxiliary motor A, so that the latter now starts rotating at its predetermined speed and drives shaft 24 and through worm 25 moves the worm wheel 3I and the planetary body 32 as a whole. The friction between the end of the toothed projection of spindle I9 and the friction shoe 48 as produced by spring 49, is sufficient so that the spindle I9 and the hollow shaft I8 turn at the same angular speed. Teeth 38 therefore actuate the spline for moving the spindle forward with a rapid initial approach feeding or traverse motion. The rotation of the hollow shaft I8 is transmitted by gear 40 to gear 4|, and the contact segment and its extension 1I turn in a counter-clockwise direction (Fig. 1), or clockwise direction arrow (Fi 9).

During this fast approach feeding of the spindle, a point is reached which by adjustment of the mechanism means a close approximation of the drill to the work. At this point the extension 1I engages brush 15. Current now flows from phase conductor I02a by conductors I03, I45, brush 12, contact ring 10, extension 1I, brush 15, conductor I4I, solenoid I39, conductor I38, conductor II3, bridge I01, conductor I04, back to phase conductor I 02b. Solenoid I 39 is energized and closes its bridges I 31 and I40.

A further circuit is also closed by energization of the solenoid I39 from phase conductor I02b, by conductor I04, bridge I01, conductors H3, I38, bridge I31, conductor I36a, solenoid I35, conductor I36, back to phase conductor I 020. The energization of solenoid I 31 causes an attraction of its plunger and the latch 44 is engaged with ratchet 43 on spindle i9, so that this spindle is brought to and maintained at a standstill.

The auxiliary motor A continues to drive the shaft 24 and thus the planetary body 3I. As the auxiliary motor A continues to turn, extension 1I moves away from brush 15. A maintaining circuit, however, remains closed from conductor 845, by bridge I 40 and conductor I4I to the solenoid [39. The teeth 39 are now stationary by reason of the operation of latch 44 so that the body 3| produces an angular movement of the pivot pin 34 relative to the spindle I 9,,and the planet pinion 35 travels on the teeth 39 and by reason of the differential numbers of teeth 31 and 39, the hollow shaft I8 is turned in the same direction as before (clockwise, Fig. 1) and the quill and spindle are fed forward but at a much lesser rate of speed.

As the drill encounters the work and begins to operate thereon, the reaction backward on the spindle is transmitted to the hollow shaft I8 and thus to the planet pinion and to the planetary body 32, and hence to the worm wheel 3I. If the reaction thus produced is greater than the thrust exerted by spring 28, the worm 25 tends to thread itself axially on shaft 24, causing a movement of plunger 21 to the right (Fig. 4) until at a pressure controlled by the tension of the spring 28 as regulated by screw device 29,

the pin 30 actuates roller 5| to close the overload switch bridge 54.

In Fig. 9, it will be seen that a circuit is now closed from conductor I45, through bridge 54, conductor I28, solenoid I05, conductor I28, back to phase conductor I020. The first movement in the "reverse" relay caused by energization of solenoid I05 is to open the normally closed bridge I25, so that the holding circuit through solenoid I08 is opened, the forward" relay opens, and the motor A is deenergized. The reverse relay controlled by solenoid I05 is constructed to pass slowly or by steps from the open to the closed position, as by the employment of a mechanical interlock between relays, which permits a partial motion of the reverse relay to open bridge I25 but prevents the further movement of the reverse relay for closing bridges I05 and H0 until the corresponding bridges I01, III of the opened. The closure of this reverse" relay also establishes a holding circuit for conductor I45, by normally closed bridge 58 of the limit switch conductor I3I, normally closed bridge I32 of the forward relay, conductor I33, bridge I34 (now closed), conductor I29, to solenoid I05 with a return by conductor I28, to phase conductor I020. The reverse relay is now held in closed position. The opening of the forward relay has, however, opened the circuit connections to conductors H2 and H3, and hence current no longer flows from conductor I I3 by conductor I38 to the solenoid I38 of the "latch relay, and the latter opens, and its bridge I31 opens the circuit through the solenoid I which controls the latch proper 44. The ratchet 43 is no longer held against rotation.

The auxiliary motor is energized through the reverse" relay and turns in the opposite direction and drives the shaft 24 and the worm 25 and thus the planetary body 32. The operation of the overrunning clutch parts 51 in conjunction with the pinion 35 prevents rotation of this pinion, and thus a rapid positive withdrawal is accomplished by the action of the teeth on spindle l8 in the rack of the quill. As the extension 'II passes brush I5, during this withdrawal movement, no action occurs.

Ultimately the extension II makes contact with brush I3. A circuit is thus closed from conductor I45, brush I2, extension II, brush I3, conductor I50, solenoid H5, conductor II8, back to phase conductor I020. The energization of solenoid II5 moves bridges H5, H1 and H9. A circuit is thus established from phase conductor I02a by conductor II4, bridge II5, conductor I20, solenoid I08, conductor I28, back to phase conductor I020. The energization of solenoid I08 moves bridge I32 to open the circuit through solenoid I06. The slow movement of the forward relay or the aforesaid mechanical interlock operates to restrict the movement of bridges I0I, III until the reverse relay has fully opened to disconnect the energization of the auxiliary motor A for reverse motion, and then permits further movement of these bridges to close circuits between conductors I04, I09 and conductors H2, H3 for the forward motion of auxiliary motor A. The extension 'II now moves back again and passes'off brush I5I, thereby opening the circuit through conductor I50 and de-energizing solenoid II5. Bridge II5 opens and solenoid I08 is de-energized and hence the auxiliary motor A comes to a standstill in the initial position set out above.

the forward" and "reverse forward relay have A similar withdrawal operation occurs when the drill has been fed forward to its limit of travel so that the extension II engages-brush 14. That is, a circuit is establishedfrom conductor I to brush 12, extension II, brush I4, conductor I28, through solenoid I05 to accomplish the closure of the reverse" relay as before.

The normally open hand switch I48 is provided to "Jog" the motor forward or cause it to advance slowly by steps into a desired position.

conductor I45 through bridge I48, conductor I50, solenoid H8, conductor II8, to phase conductor I02c. Bridge II5 (closed by energizing solenoid II5) closes an energizing circuit for. solenoid I08 which continues as long as this bridge is closed, 1. e. so long as switch I48 is in closed position. This is a desirable feature for setting the tools and devices into properly related positions.

The motor may be reversed at any part of the cycle to fully withdraw the drill regardless of the position of the spindle, and without the engagement of brush "or the closure of the overload switch bridge 84. This is done by a manually .operable reverse switch having a bridge I30.

Upon closing this bridge, current flows by conductor I45, limit switch bridge 58, conductor I3I, bridge I30, conductor I28, solenoid I06, conductor I28, back to phase conductor I02c. If bridge I30 is released before the spindle is fully retracted or withdrawn, the aforesaid holding circuit through bridge I34 maintains the solenoid I05 energized. The forward relay solenoid circuit is opened at bridge I25 as before. The spindle is thus returned to the initial position. Upon attaining the initial position, limit switch bridge 58 is opened so that the control of the mechanism is removed from bridge I30. In this connection also, it will be noted that if a proper contact is not made for some reason, between extension II and brush I3, during the withdrawal movement, the motor continues in reverse until the limit switch 58 operates to de-energize solenoid I08.

In the modified circuit arrangement shown in Figure 9a, most of the connections are similar to those provided in the diagram of Figure 9 and corresponding reference numerals are employed. In the form shown in Fig. 9, bridges I25 and I32 are provided on the forward and reverse relays; while in the diagram of Figure 9a, a separate supervising" relay is provided having an energizing solenoid I60 and the bridge I25a which normally closes a circuit between conductors I24 and I25 and thus has the same function as bridge I25 in Fig. 9. The trip relay under control of solenoid 5 has a further bridge I32a which normally closes a circuit between conductors I3I and I33 and thus has the same function as bridge I32 in Fig. 9.

correspondingly, conductor I28 is connected to one contact of switch bridge 54, brush I4, one contact of the reverse" switch I80 and a normally open contact of bridge I5I in the supervising relay. Conductor I28a which connects one ter minal of solenoid I05 of the reverse relay is connected to a normally open contact of bridge I34, and to the other normally open contact of bridge I5I. Conductor I28 is connected as before with solenoid I05 and I08 and in Fig. 9 is also extended to the solenoid I which at its other end is connected to conductor I29.

The operation of the apparatus with this circuit connection is substantially as before in function. When the extension II encounters in when switch I48 is closed, a circuit is formed from brush" or when the overload limit switch 8! is closed, current flows from the bus conductor I."

to the conductor I29. This circuit then 0 tinuesthrough the solenoid I60 to conductor l2 The energization of solenoid I60 causes an immediate opening at bridge I251; between conductors m and I26, and the solenoid M38 of the forward relay is de-energized, and this relay opens so that tne motor will come to a standstill after a very few revolutions. The "supervising relay also closes its bridge 16! and thus establishes a further circuit from conductor I29 through conductor l29a: for energizing the solenoid wt of the reverse relay. This reverse relay now closes and establishes its own maintaining circuit for solenoid I06; and also connects the motor A for operation in the reverse direction with the same results as before. As extension it leaves brush 15, or the overload limit switch bridge 6d opens, conductor I29. is de-energized along with the solenoid I60. Bridge iti opens the initiating circuit to solenoid E06 but this solenoid is now being energized through its maintaining circuit.

. Bridge 92501. of the supervising relay closes a tentative circuit through conductors i2 5 and 82h which is completed as a holding circuit for the solenoid 608 of the forward relay whenever this solenoid is again energized.

It is obvious that many changes in the com struction may be made, while maintaining the same function and inter-relationship of the major elements, without departure from the scope of the appended claims.

What is claimed and desired to secure by Letters.

Patent 15-- 1. In a. device of the class described, the combination of a frame, a tool support reciprocable relative to said frame a planetary body, gears coaxial with said body and having diiierent numbers of teeth, gear means rotatably mounted on said body and in mesh with said gears, means for rotating said body, a detent mounted on the frame for holding one said gear against rotation, a connection between the other gear and said support for reciprocating the latter, and means controlled by the position of the element relative to the frame actuated upon predetermined move ments of said other gear for effecting the engagement of said detent during the course of movement of said support in one direction and disengagement of said detent at the end of such movement in said one direction.

- 2. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to the frame, means for reciprocating the tool holder including a planetary body and means to drive the same, gears having different numbers of teeth and coaxial with said body, gear means rotatable about an axis on said body and in mesh with said gears, a ratchet secured to one said gear, a latch, means operated by the other gear to reciprocate said tool holder,- and means controlled by the position of said tool holder during its feeding movement toward the work for engaging said latch with said ratchet for holding the latter against rotation.

3. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to the frame, means for reciprocating the tool holder including a planetary body and means to drive the same, gears having difierent numbers of teeth and coaxial with said body, gear means rotatable about an axis on said body and in mesh with said gears, a ratchet secured to one said gear, a latch, means operated by the other gear to reciprocate said tool holder, electromagnetic means for engaging said latch with said ratchet, and circuit means including a circuit closing device having a contact moving with said tool holder for energizing said electromagnetic means at a predetermined position. of feeding movement.

4. In a device of the class described, the combination oi a frame, a tool holder reciprocable relative to the frame, means for reciprocating the tool holder including a planetary body and means to drive the same, gears having difi'erent numbers of teeth and coaxial with said body, gear means rotatable about an axis on said body and in mesh with said gears, a ratchet secured to one said gear, a latch, means operated by the other gear to reciprocate said tool holder, electromagnetic means for engaging said latch with said ratchet, a contact member rotated by said other gear, a cooperating contact member, and circuit means forconnecting said electromagnetic means and contact members.

5. In a device of the class described, the combination of a. frame, a tool holder reciprocable relative to said frame, a motor operatively connected to reciprocate said tool holder through a planetary transmission, a releasable latch for com trolling said transmission and efiecting rapid or slow reciprocating movement accordingly as said latch is released or engaged, a forward relay, a reverse relay, contact means controlled by the position of the tool holder and closed as the tool approaches the work, switch means for causing said forward relay to efiect energization of said motor, electromagnetic means for engaging said latch, connections between said contact means and latch for engaging said latch, and further contact means and connections therewith for deenergizing said latch when said forward relay is opened.

6. In a device of the class described, the com= bination of a frame, a tool support reciprocahle relative to said frame, a planetary body, gears coaxial with said body and having different numbers of teeth, gear means rotatably mounted on said body and in mesh with said gears, means for rotating said body, a detent mounted on the frame for holding one said gear against rotation, friction means for causing said gears to rotate together when said detent is disengaged, a connection between the other gear and said support for reciprocating the latte and means for engaging and disengaging said detent whereby to produce different speeds of reciprocation of said support.

7. In a device of the class described, the combination of a. frame, an element reciprocable relative to the frame, a planetary gearing including a rotatable body, two gears having diiferent numbers of teeth, pinion means on said body and engaged with said gears, power driving means for said body, means operated by one said gear for moving said element, a releasable detent mounted on the frame for holding the" other said gear against movement, friction means for causing said gears to turn together when said detent is released, a control member driven by said one gear, and means energized by said control member for engaging and disengaging said detent.

8. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to the frame, means for reciprocating the tool holder including a planetary body and power means to drive the same, two gears, planet pinion means eccentrically mounted on said planetary body and ln'mesh with said two gears, detent means for holding one said gear against rotation so that the planetary body then operates through the pinion means for efiecting movement of the other gear at a slow rate while the pinion means is being rotated in one direction, and means for preventing rotation of said pinion means in the other direction and thereby causing said gears to turn together, said reciprocating means including a connection from the other gear to the tool holder.

9. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to the frame, means for reciprocating the tool holder including a planetary body and means to drive the same, two gears, planet pinion means eccentrically mounted on said planetary body and in mesh with said two gears, detent means for holding one said gear against rotation so that the planetary body operates through the pinion means for effecting movement of the other gear at a slow rate while the pinion means is being rotated in one direction, means for preventing rotation of said pinion means in the other direction and thereby causing said gears to turn together, said reciprocating means including a connection from the other gear to the tool holder, and a device for causing said gears to turn together during rotation of the pinion means in said one direction so long as the said detent means is disengaged.

10. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to the frame, and reversible means for reciprocating the tool holder including a planetary body and a reversible source of power to drive the same, planet pinion means eccentrically journalled on the body and in mesh with said gears,

a releasable detent means for holding one of said gears against movement, a spring, and friction means on said one gear and body urged to engaged position by said spring and thereby operating to cause said one gear to turn with the body when said detaining means is released and operating to permit relative movement thereof when said detaining means is engaged, and means connecting the other said gear with the tool holder.

11. A device as in claim 10, in which said releasable detent means includes devices for holding the same out of detaining position during a first part of the forward movement of the tool so that the planetary body and gears are connected by the friction means to turn at like speeds and the tool holder is advanced rapidly, and thereafter operating to hold the said one gear against movement so that the planetary body and other gear move at different speeds to advance the tool slowly, and overrunning clutch means for preventing relative movements of said planetary body and gears during the reverse movement of said reversible means for the withdrawal of the tool for effecting a positive return movement of the tool holder.

12. In a device of the class described, the combination of a frame, a tool holder reciprocable relative to said frame, means for reciprocating said tool holder including a reversible source of power, a pair of shafts and differentiating gear means for connecting said shafts and the source, detent means for selectively holding one said shaft against movement, means connecting the other said shaft to the tool holder, a selective contact member rotated with said other shaft, three cooperating contact members, and circuit means connecting said contact members and operative successively for producing a forward movement of the source forimoving the tool holder rapidly, thereafter for engaging said detent means for effecting a slow movement of the tool holder through said differentiating gearing, and thereafter for producing a reverse movement of the source for moving the tool holder rapidly back to withdrawn position.

13. In a device of the class described, the combination of a frame, a tool support reciprocable relative to said frame, a planetary body, first and second gears coaxial with said body and having different numbers of teeth, a shaft fixed on said body eccentric to said gears, connected gear members rotatable on said shaft and in mesh with said gears, power means for rotating said body in forward and reverse directions, a connection between said first gear and said support for reciprocating the latter, a detent for holding said second gear against rotation during the forward drive for compelling relative rotation of said body and gear means whereby said first gear is revolved at a speed slower than that of said planetary body, an overrunning clutch for resisting a backward movement of the gears relative to the planetary body whereby said first gear is revolved at the speed of said planetary body when said detent is released from said second gear.

14. In a device of the class described, the combination of a frame, an element reciprocable relative to the frame, a differentiating gearing having three relatively movable members, reversible means for driving one of said members, means connecting a second of said members with said element to reciprocate the same, a releasable detent for the third of said members, friction means for causing said members to turn together when said one member is driven in one direction and the detent is inoperative, positive clutch means for causing said members to turn together when said one member is driven in the other direction and the detent is operative, said detent operating upon engagement while said one member is driven in said one direction to effect a change of the rate of movement of said element, and devices for selectively engaging and disengaging said detent and for reversing said reversible means.

15. In a device of the class described, the combination of a frame, an element reciprocable relative to the frame, a planetary gearing including a rotatable body, two gears having different numbers of teeth, and pinion means on said body and engaged with said gears, power driving means for said body, means operated by one said gear for moving said element, a releasable detent mounted on the frame for holding the other said gear against movement, automatically operating means for causing said gears to turn together when said detent is released, and means operated upon a predetermined movement of the element for engaging and disengaging said detent-whereby to change the speed of movement of said element.

16. In a device of the class described, the combination of a frame, an element reciprocable relative to the frame, a planetary gearing including two gears having different numbers of teeth, and a body having pinion means connecting said gears, means operated by one said gear for moving said element, a releasable detent for holding the other said gear against movement, adjustable friction means between said other gear and the body for causing said body and gears to turn together when said detent is released, means engaging with and operable for rotating said body, and means operated upon a predetermined movement of the element for engaging and disengaging said detent whereby to change the speed of movement of said element.

17.' In a device of the class described, the combination of a frame, an element reciprocable relative to the frame, a reversible electric motor for reciprocating said element at high and at low speeds, diiferentiating gearing including a body, sun gears and pinion means carried by the body, one sun gear being connected for moving said element and said body being connected for driving by said motor, a detent for holding said other sun gear against rotation, control means operative for engaging and disengaging said detent, a contact member moving with said element, cooperating contact members positioned for engagement with said moving contact member when the element is at either end of a predetermined stroke, and during an intermediate position of movement from one end toward the other, means including circuits closed by said contact members for energizing said motor and control means for causing the element to make a rapid initial movement and a slow final movement in one direction and a rapid movement in the other direction, and means responsive to reaction pressure on said element for reversing the direction of rotation of said motor.

18. In a device of the class described, a frame, an element movable back and forth relative to the frame, a reversible source of power, means driven by said source for moving the element back and forth in accordance with the direction of energization of said source, said moving means including gearing for producing a rapid and a slow movement of said element, electromagnetically operated means for selecting the operation of said gearing for said slow movement, said moving means also including devices for selecting the operation of said gearing for said rapid movement when said electromagnetically operated means is de-energized, circuit control means and associated circuit means operated by the said element during its forward and reverse movements for reversing the energization of said source, further circuit means connected with said associated circuit means and said electromagnetically operated means for de-energizing said electromagnetically operated means when the source is energized for reverse movement of the carriage, and a circuit closer for energizing said further circuit means.

19. In a device of the class described, a frame, an element movable back and forth relative to the frame, a reversible source of power, means driven by said source for moving the element back and forth in accordance with the direction of energization of said source, said moving means including gearing for producing a rapid and a slow movement of said element, electromagnetically operated means for selecting the operation of said gearing for said slow movement, said moving means also including devices for selecting the operation of said gearing for said rapid movement when said electromagnetically operated means is de-energized, circuit control means and associated circuit means operated by the said element during the forward and reverse movements for reversing the energization of said source, further circuit means for energizing said electromagnetically operated means, a circuit closer for energizing said further circuit means controlled by the element for closure-at a predetermined position of forward movement thereof, and devices included in said associated circuit means for holding said further circuit means and electromagnetically operated means de-energized during the energization of the source for reverse movement.

20. In a device of the class described, a frame, an element movable back and forth relative to the frame, a reversible feed motor, forward and reverse relays for connecting the motor for forward and reverse movements, feed mechanism driven by said motor for moving the element back and forth and including devices for producing fast and slow movements thereof, a solenoid and means operated thereby for selectively controlling said devices to produce a slow forward movement upon energization of the solenoid, said devices cooperating to produce a fast movement when said solenoid is de-energized, a circuit for energizing said solenoid, circuit means for energ= izing said forward and reverse relays and including contacts of said relays to provide maintaining circuits for each relay which are closed while the corresponding relay is closed and the other relay is open, and circuit closure means operated with the movement of said element for effecting initial energization of said forward and reverse relays at withdrawn and advanced positions of said element and for energizing said sole-= noid circuit during the course of the forward movement of the element, said solenoid energizing circuit including a maintaining branch controlled by said forward and reverse relays so that the solenoid is tie-energized upon energiza= tion of the reverse relay.

21. In a device of the class described, the combination of a, frame, a tool support reciprocable relative to said frame, a planetary body, two gears coaxial with said body and having diiferent numbers of teeth, gear means rotataioly mounted on said body and in mesh with said gears, means for rotating said body, a detent for holding one said gear against rotation, a connection between the other gear and said support for reciprocating the latter, means actuated upon predetermined movements of said other gear for effecting the engagement of said detent during the course of movement of said support in one direction and disengagement of said detent at the end of such movement in said one direction, and means responsive to the tool pressure for likewise effecting the disengagement of said detent and a reversal of said rotating means.

22. In a device of the class described, a frame, a tool holder reciprocable relative to the frame, power means for reciprocating said tool holder, said power means including a reversible motor and a train of gears including differentiating gearing consisting of a driving member connected to the motor, a driven member connected to the tool holder, and a third member, devices for controlling the difierentiating gearing and including a detent cooperative with the third member for releasing and holding the same and thereby changing the speed between a rapid traverse rate and a slow feed rate, a solenoid for selectively operating said detent to change the rate, and control switches operated upon the movement of the tool holder for controlling the energization of the solenoid and the direction of energization of the power means.

23. In a device of the class described, the'combination of a frame, an element reciprocable actuated by the motor for reciprocating said element at high and at low speeds including a ditierentlating gear train consisting of a driving member connected to the motor, a driven member connected to the element, and a third memher, a detent operative when engaged with the third member for causing said train to produce a low speed, means operative when the detent is disengaged for causing all said members to turn together for producing a high speed, reversing means responsive to the reaction against forward movement oi said element for causing a reversal of the motor and a rapid withdrawal of said element, reversing means operated by said element at the end of its withdrawal movement for again reversing the motor, means included in said reciprocating means and operated by said element during its rapid forward movement for effecting a movement of the detent into engagement with the third member, and limit means operated by the element at the end of its predetermined maximum forward movement for causing a final reversal of said motor and a return of said element to and its maintenance in withdrawn position.

24. A device oi the class described comprising 9,080,007 relative to the frame, a reversible motor, means a frame, a member to be advanced relative'to the frame, a revoluble element providing a planetary body and means ior driving the same,

planet pinion means eccentrically mounted on said planetary body, two sun gears each in mesh with said planet pinion means, devices connecting said one sun gear with said member to advance the same, constantly operating friction means for causing said body to turn one said sun gear and move said devices andadvance said member at a last rate so long as the resistance opposed to advancement of said member is less than a predetermined maximum, said friction means slipping when mid maximum resistance is exceeded, means for adjusting said friction means for determining said maximum resistance, said body, pinion means and sun gears being constructed and arranged for producing a relative forward movement of the said one sun gear rela tive to the other said sun gear upon slippage of said friction means, and means for preventing retrograde movement of said other sun gear relative to said frame whereby to cause a slow rate of advancement of said member by said devices.

EDWARD JOSLIN KINGSBURY. 

